If it's OK to use rectangular boxes for the numbers instead of circles, you could use one of the callout autoshapes; otherwise you could create a generic autoshape circle, which you apply the 'add text' property to, format the paragraph as centred with 0 space before/after, then insert an arrow, which you align with the circle, then group them together. You can then paste the set wherever you need it and add text/numbers to the circle. Being separate objects, you can even make the circle and arrow different colours!

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]